• Asian Pacific Journal of Cancer Prevention
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• 제15권2호
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• pp.877-881
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• 2014

Objective: To evaluate risk factors for gallstones after gastrectomy. Methods: To identify documents published from 1990 to 2011 the Pubmed, Cochrane Library, Springer Link, CBM and WanFang databases were searched and a meta-analysis was performed with RevMan 5.2 software for odds ratios and 95%CIs. Results: Fifteen studies were selected for the meta-analysis. The pooled ORs [95%CIs] were 0.56 [0.43, 0.73], (P<0.0001) for digestive tract reconstruction, 0.80 [0.54, 1.17], (P=0.25) for pylorus preservation, 0.33[0.15, 0.75], (P=0.008) for resection scope of stomach, 0.33 [0.15, 0.75], (P=0.008) for lymphadenectomy, and 0.13 [0.05, 0.33], (P<0.0001) for vagotomy. Conclusions: Digestive tract physical reconstruction and vagus nerve preservation can reduce the morbidity of gallstones after gastrectomy. Total gastrectomy can add to the morbidity of galltones as does increasing the degree of lymph node dissection. There was no significant difference in gallstones with or without pylorus preservation.

• Asian Pacific Journal of Cancer Prevention
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• 제15권24호
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• pp.10683-10690
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• 2015

The big gap between efficacy of population level prevention and expectations due to heterogeneity and complexity of cancer etiologic factors calls for selective yet personalized interventions based on effective risk assessment. This paper documents our research protocol aimed at refining and validating a two-stage and web-based cancer risk assessment tool, from a tentative one in use by an ongoing project, capable of identifying individuals at elevated risk for one or more types of the 80% leading cancers in rural China with adequate sensitivity and specificity and featuring low cost, easy application and cultural and technical sensitivity for farmers and village doctors. The protocol adopted a modified population-based case control design using 72, 000 non-patients as controls, 2, 200 cancer patients as cases, and another 600 patients as cases for external validation. Factors taken into account comprised 8 domains including diet and nutrition, risk behaviors, family history, precancerous diseases, related medical procedures, exposure to environment hazards, mood and feelings, physical activities and anthropologic and biologic factors. Modeling stresses explored various methodologies like empirical analysis, logistic regression, neuro-network analysis, decision theory and both internal and external validation using concordance statistics, predictive values, etc..

• 한국미생물학회:학술대회논문집
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• 한국미생물학회 2008년도 International Meeting of the Microbiological Society of Korea
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• pp.118-118
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• 2008

The phylogenetic diversity of microbial communities in calcareous mats from Spearfish Creek, a freshwater stream located in the Black Hills of South Dakota, was examined using PCR-based 16S rDNA sequence analysis. In this study, two types of calcareous mats were compared: mature mats formed on the natural substrate of rock surfaces and developing mats on an artificial substrate of glass slides. Among 63 unique isolates from a clone library of 16S rRNA genes from mature mat samples, there were 8 phyla of Bacteria represented. The predominant phylum was Proteobacteria (48%), with the $\beta$ subclass being the largest group. Denaturing gradient gel electrophoresis (DGGE) analysis of 16S rRNA genes from slide samples collected at intervals for four months showed considerable diversity of the microbial community from the earliest stages of community development. Amplicons isolated from DGGE gels and sequenced indicated that community succession has occurred without increasing microbial diversity. However, light microscopic analysis revealed a significant increase in microbial cell density throughout the community development. Scanning electron microscopy of mat samples provides evidence that diatoms are also important members of calcareous mat communities.

• 센서학회지
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• 제15권1호
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• pp.34-39
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• 2006

This study provides the electrical model of combustible catalytic gas sensor. Physical characteristics such as thermal behavior, resistance change were included in this model. The finite element method analysis for sensor device structure showed that the thermal behavior of sensor is expressed in a simple electrical equivalent circuit that consists of a resistor, a capacitor and a current source. This thermal equivalent circuit interfaces with real electrical circuit using two parts. One is 'power to heat' converter. The other is temperature dependent variable resistor. These parts realized with the analog behavior devices of the SPICE library. The gas response tendency was represented from the mass transferring limitation theory and the combustion theory. In this model, Gas concentration that is expressed in voltage at the model, is converted to heat and is flowed to the thermal equivalent circuit. This model is tested in several circuit simulations. The resistance change of device, the delay time due to thermal capacity, the gas responses output voltage that are calculated from SPICE simulations correspond well to real results from measuring in electrical circuits. Also good simulation result can be produced in the more complicated circuit that includes amplifier, bios circiut, buffer part.

• 정보관리연구
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• 제35권2호
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• pp.1-40
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• 2004

학위논문은 석박사 과정의 학생들이 학위를 취득할 목적으로 자신의 전공분야와 특정 관점에서 조사 연구한 결과를 제출한 독창성이 높은 연구자료를 말한다. 그러나 학위논문은 상업출판사에서 발간하지 않기 때문에 대다수 도서관도 책자형태로 확보할 수 없다. 이에 따른 실물의 즉시적 이용가능성 및 내용정보의 부재현상은 모든 국가에서 학위논문의 활용도가 극히 낮을 수밖에 없는 요인으로 작용하고 있다. 이러한 상황에 주목하여 본 연구는 학위논문의 국제적 유통현황을 개관하고 국내의 관리시스템을 조사 분석하였다. 그리고 본 연구의 결과는 후속의 최종과제인 국내 학위논문의 표준관리모형을 개발하는데 활용될 것이다.

• 대한가정학회지
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• 제26권3호
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• pp.135-152
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• 1988

The purpose of this study was to survey the improvement activities for the apartment house ; and to examine the relationship between apartment residents and their housing improvement activities in order to present some informations for the further studies and plans of apartment design and housing policy. Library and questionnaire survey methods were used in this research. the sample was taken from 102 housewives living in the apartments over 45 pyong (1602 sq. ft.), in Seoul, Data were analyzed with the SPSS using frequency, percentage, chi-square test, F-test, Duncan's multiple range test, η2, and C2. The results were as follows: 1. It was found that residents had experienced with 3.6 kinds of housing improvement activities. Living rooms, dining rooms, and kitchens in family living areas ; balconies and utility rooms in utility areas were improved for the physical convenience and quality of living. 2. This survey indicated that apartment residents evaluated thier housing condition as high, except storage spaces and outdoor noises. 3. About 80% of respondents were expected to live continuously in the current apartments because they were satisfied with the size of thier residences, However, they wanted to improve the inside of the entire apartment, especially bathrooms. 4. Variables which had a significant relationship in housing improvement activities in the past were the length of residence, the expected length of residence, and the characteristic of residence. 5. The expected length of residence, and the characteristic of residence were found to be effective variable for evaluating the current residence. 6. Finally, the expected length of residence, and the characteristic of residence were significant variables of the housing plan in the future. Housing improvement activities were prevalent recently and expected to be continued in the future. It can be said, therefore, that apartment residents have a long -term plan to live in one place rather than moving out ever two-three years.

• 한국컴퓨터정보학회논문지
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• 제18권5호
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• pp.53-60
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• 2013

본 논문에서는 키넥트 센서에 의해 획득한 스켈레톤 정보를 이용하여 스노보드 동작을 시각화 할 수 있는 도구를 제안한다. 스노보드 동작에서 가장 기본이 되는 동작은 BBP(Balanced Body Position)자세로서 안정된 턴 동작을 위한 기본 기술이다. 본 논문에서는 BBP자세를 분석하여 가장 이상적인 동작을 실현할 수 있는 시각화 도구를 구현한다. 키넥트 센서로 부터 획득한 좌표정보를 이용하여 발목, 무릎, 엉덩이 관절의 각도와 몸의 중심축을 추적하여 표준 자세와 비교분석한다. 분석결과는 OpenGL 라이브러리를 통하여 최종 결과 화면을 구성하였다. 본 연구결과는 스노보드 턴 동작을 분석하는 기초자료로 활용될 수 있을 것이다.

• 약학회지
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• 제57권2호
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• pp.125-131
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• 2013

Biologically active peptides, including growth factors and cytokines, participate in various biological processes in human skin. They could provide a great advantage of maintaining healthy skin. Many peptide growth factors like epidermal growth factor (EGF) and human growth hormone (hGH) have been used in cosmetic formulations. The delivery of peptide growth factors across the Stratum corneum, however, seems not sufficient because of their physical properties such as high molecular weight and hydrophilicity. So increasing the penetration of growth factors of interest into skin would be a major concern for ensuring their maximum biological efficacy. In this study, we have identified several skin penetration-enhancing peptides which facilitate delivery of growth factors, when fused at N-terminus of the target protein, into skin. For efficient and rapid screening, we constructed a skin-penetrating assay system using Franz cell and porcine skin. Next, we carried out phage display screening using M-13 bacteriophage with random 12 -amino acid library on its coat protein P3 on that system. After several selection rounds, peptide sequences facilitate the penetration of phages through the porcine skin were identified from a large population of phages. We found that phages with the most potent peptide (S3-2, NGSLNTHLAPIL) could penetrate the porcine skin eight times more than those with control peptide (12 mino acids scrambled peptide). Furthermore, growth factors conjugated with S3-2 peptide penetrate porcine skin three to five times efficiently than non-conjugated growth factors. In conclusion, our data shows that the skin penetration-enhancing peptide we have characterized could increase the delivery of growth factors and is useful for cosmeceutical application.

• 한국통신학회논문지
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• 제25권9A호
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• pp.1332-1339
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• 2000

본 논문에서는 MCNS(Multimedia Cable N$\xi$twork System)의 DOCSIS(Data Over Cable Service Interface S Specification) 표준안의 물리계층을 지원하는 비대칭형 기저대역 모댐 ASIC 칩의 아키텍쳐와 설계에 대해 기술한다. 구현한 모뎀 칩은 크게 QPSK/16-QAM 방식의 상향 스트림용 송신부와 64/256-QAM 방식의 하향 스트림용 수신부로 구성되어 있으며, 심볼 타이밍 복구회로, 반송파 복구회로. MMA(Multi Modulus Algorithm)와 LMS(Least Mean Square) 알고리즘을 적용한 결정 궤환 구조의 블라인드 등화기를 포함한다. 구현한 모뎀 칩은 64/256-QAM 변복조 방식에서 각각 48Mbps, 64Mbps의 데이터 전송률을 지원하고, 심볼 전송률은 기존의 QAM 수신기들보다 빠른 8MBaud를 갖는다. 구현한 칩은 $0.35\mu\textrm{m}$ 표준 셀(Standard Cell) 라이브러리를 사용하여 논리합성을 수행하였으며, 총 게이트 수는 약 29만 게이트이며, 현재 ASIC 칩으후 제작중이다.

• 한국산학기술학회논문지
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• 제17권1호
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• pp.453-458
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• 2016

머신비전은 고속화된 자동화 생산 시스템의 품질 검사 방법으로 널리 활용되어 왔다. 본 연구에서는 멀티카메라를 사용하여 PC와 PLC 간 제어를 통해 용접부위의 치수를 실시간으로 측정하여 검사하는 머신비전 시스템을 개발하였다. 제안한 검사시스템은 맞대기 용접부위의 길이와 폭을 측정하여 용접부의 치수 균일성을 검사하도록 설계하였다. 광학계 및 물류는 병렬제어를 위해 PC와 PLC 간 TCP/IP 멀티쓰레딩 통신기법을 적용하였다. 금속재료의 반사 특성을 고려하여 용접비드의 형태나 용접시 발생하는 그을음에도 균일하게 검사부위의 영상획득이 가능한 동축조명계를 적용하였고, 검사 알고리즘은 OpenCV 라이브러리를 사용하여 용접치수검사에 맞게 개발하였다. 제작한 시스템을 실제 전자부품의 용접 자동화 라인에 설치하여 시스템의 작동오류 및 검사 성능을 검증한 결과, 요구되는 기능 및 검사 성능을 모두 성공적으로 수행하였다.